21
To calibrate the sensor in buffer solutions, the sensor and a solution ground wire must be in the
container of the buffer solution. Perform the two-point calibration as follows:
Initialize the calibration.
Shut the isolation valves to the controller plumbing assembly.
Open the controller front panel. Disconnect the solution ground wire from terminal 5 of
terminal block P7.
Connect a wire that has been stripped at both ends to terminal 5 of terminal block P7.
Place the ORP sensor and the wire connected in the previous step into the lower value
buffer solution.
Press ―CAL‖, select ―ZERO‖. Use the keypad to enter the calibration value. Press ―ENT‖.
Place the sensor and solution ground wire into the higher value buffer solution.
Press ―CAL‖, select ―SPAN‖. Use the keypad to enter the calibration value. Press ―ENT‖.
Re-install the sensor into the plumbing. Ensure locking ring is locked.
Remove the stripped wire from terminal block P7 and re-attach the solution ground wire.
Restore flow to plumbing assembly
Perform a single point calibration if necessary.
12.5 Calibration Check of ORP in Buffer solutions
To check the calibration of the sensor in buffer solutions, the sensor and a solution ground wire are
necessary. Perform the calibration check as follows:
Initialize the calibrations.
Shut the isolation valves to the controller plumbing assembly.
Open the controller front panel. Disconnect the solution ground wire from terminal 5 of
terminal block P7.
Connect a wire that has been stripped at both ends to terminal 5 of terminal block P7.
Place the ORP sensor and the wire connected in the previous step into the buffer
solutions.
Verify calibrations in at least two buffer solutions at least 2 pH apart.
Re-install the sensor into the plumbing. Ensure locking ring is locked.
Remove the stripped wire from terminal block P7 and re-attach the solution ground wire.
Restore flow to plumbing assembly
Perform a single point calibration if necessary
13 Main Menu
The MAIN MENU looks like this:
MAIN MENU
=============
1 PROCESS
2 RELAYS
3 CALENDAR TIMER
4 ALARMS
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